Invited paper: Preparation and electrochemical characterization of doped spinel LiMn1.88Ge0.1Li0.02O4 cathode material

Sung Wook Kim; Vadam Ganesh Kumar; Dong Hwa Seo; Young Uk Park; Jinsoo Kim; Haegyeom Kim; Jongsoon Kim; Jihyun Hong; Kisuk Kang

doi:10.1007/s13391-011-0603-z

Invited paper: Preparation and electrochemical characterization of doped spinel LiMn_1.88Ge_0.1Li_0.02O₄ cathode material

Sung Wook Kim, Vadam Ganesh Kumar, Dong Hwa Seo, Young Uk Park, Jinsoo Kim, Haegyeom Kim, Jongsoon Kim, Jihyun Hong, Kisuk Kang

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

LiMn_1.88Ge_0.1Li_0.02O₄ cathode material is investigated with the aim of improving the electrochemical performance of spinel LiMn₂O₄ by substituting stoichiometric Ge and Li into Mn sites. While the formal oxidation number of Mn ions is still + 3.5 after doping, it is expected that the difference in electronegativity between Mn and Ge induces a local change in the bonding nature of Mn-O that in turn increases the effective oxidation state of Mn ions. The increase in the effective oxidation state results in a reduction of Mn dissolution, thus providing structural stability and cyclability. The bulk-synthesized LiMn_1.88Ge_0.1Li_0.02O₄ exhibits capacity retention of 63% of the first cycle capacity (124 mAh/g) after 100 cycles at 1C while LiMn₂O₄ exhibits only 44% retention.

Original language	English
Pages (from-to)	105-108
Number of pages	4
Journal	Electronic Materials Letters
Volume	7
Issue number	2
DOIs	https://doi.org/10.1007/s13391-011-0603-z
State	Published - Jun 2011
Externally published	Yes

Keywords

cathode
Li ion battery
LiMnO
Mn dissolution
spinel

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1007/s13391-011-0603-z

Cite this

@article{34a24961ce354adcb80b6a0058a3997a,

title = "Invited paper: Preparation and electrochemical characterization of doped spinel LiMn1.88Ge0.1Li0.02O4 cathode material",

abstract = "LiMn1.88Ge0.1Li0.02O4 cathode material is investigated with the aim of improving the electrochemical performance of spinel LiMn2O4 by substituting stoichiometric Ge and Li into Mn sites. While the formal oxidation number of Mn ions is still + 3.5 after doping, it is expected that the difference in electronegativity between Mn and Ge induces a local change in the bonding nature of Mn-O that in turn increases the effective oxidation state of Mn ions. The increase in the effective oxidation state results in a reduction of Mn dissolution, thus providing structural stability and cyclability. The bulk-synthesized LiMn1.88Ge0.1Li0.02O4 exhibits capacity retention of 63\% of the first cycle capacity (124 mAh/g) after 100 cycles at 1C while LiMn2O4 exhibits only 44\% retention.",

keywords = "cathode, Li ion battery, LiMnO, Mn dissolution, spinel",

author = "Kim, \{Sung Wook\} and Kumar, \{Vadam Ganesh\} and Seo, \{Dong Hwa\} and Park, \{Young Uk\} and Jinsoo Kim and Haegyeom Kim and Jongsoon Kim and Jihyun Hong and Kisuk Kang",

year = "2011",

month = jun,

doi = "10.1007/s13391-011-0603-z",

language = "English",

volume = "7",

pages = "105--108",

journal = "Electronic Materials Letters",

issn = "1738-8090",

publisher = "Springer Netherlands",

number = "2",

}

TY - JOUR

T1 - Invited paper

T2 - Preparation and electrochemical characterization of doped spinel LiMn1.88Ge0.1Li0.02O4 cathode material

AU - Kim, Sung Wook

AU - Kumar, Vadam Ganesh

AU - Seo, Dong Hwa

AU - Park, Young Uk

AU - Kim, Jinsoo

AU - Kim, Haegyeom

AU - Kim, Jongsoon

AU - Hong, Jihyun

AU - Kang, Kisuk

PY - 2011/6

Y1 - 2011/6

N2 - LiMn1.88Ge0.1Li0.02O4 cathode material is investigated with the aim of improving the electrochemical performance of spinel LiMn2O4 by substituting stoichiometric Ge and Li into Mn sites. While the formal oxidation number of Mn ions is still + 3.5 after doping, it is expected that the difference in electronegativity between Mn and Ge induces a local change in the bonding nature of Mn-O that in turn increases the effective oxidation state of Mn ions. The increase in the effective oxidation state results in a reduction of Mn dissolution, thus providing structural stability and cyclability. The bulk-synthesized LiMn1.88Ge0.1Li0.02O4 exhibits capacity retention of 63% of the first cycle capacity (124 mAh/g) after 100 cycles at 1C while LiMn2O4 exhibits only 44% retention.

AB - LiMn1.88Ge0.1Li0.02O4 cathode material is investigated with the aim of improving the electrochemical performance of spinel LiMn2O4 by substituting stoichiometric Ge and Li into Mn sites. While the formal oxidation number of Mn ions is still + 3.5 after doping, it is expected that the difference in electronegativity between Mn and Ge induces a local change in the bonding nature of Mn-O that in turn increases the effective oxidation state of Mn ions. The increase in the effective oxidation state results in a reduction of Mn dissolution, thus providing structural stability and cyclability. The bulk-synthesized LiMn1.88Ge0.1Li0.02O4 exhibits capacity retention of 63% of the first cycle capacity (124 mAh/g) after 100 cycles at 1C while LiMn2O4 exhibits only 44% retention.

KW - cathode

KW - Li ion battery

KW - LiMnO

KW - Mn dissolution

KW - spinel

UR - https://www.scopus.com/pages/publications/79960116217

U2 - 10.1007/s13391-011-0603-z

DO - 10.1007/s13391-011-0603-z

M3 - Article

AN - SCOPUS:79960116217

SN - 1738-8090

VL - 7

SP - 105

EP - 108

JO - Electronic Materials Letters

JF - Electronic Materials Letters

IS - 2

ER -